Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Wed 4 Jan 1989 | Harrow | 1 | 1 | Serious |
| Thu 5 Jan 1989 | Harrow | 2 | 1 | Slight |
| Sat 7 Jan 1989 | Harrow | 2 | 1 | Slight |
| Fri 13 Jan 1989 | Harrow | 2 | 5 | Serious |
| Fri 13 Jan 1989 | Harrow | 2 | 1 | Slight |
| Sun 15 Jan 1989 | Harrow | 2 | 1 | Serious |
| Sun 15 Jan 1989 | Harrow | 2 | 1 | Slight |
| Mon 16 Jan 1989 | Harrow | 1 | 1 | Slight |
| Thu 19 Jan 1989 | Harrow | 2 | 1 | Slight |
| Sat 21 Jan 1989 | Harrow | 2 | 1 | Slight |
| Fri 27 Jan 1989 | Harrow | 3 | 3 | Serious |
| Tue 31 Jan 1989 | Harrow | 1 | 1 | Slight |
| Thu 2 Feb 1989 | Harrow | 2 | 3 | Slight |
| Fri 3 Feb 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Feb 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Feb 1989 | Harrow | 2 | 1 | Slight |
| Thu 9 Feb 1989 | Harrow | 1 | 1 | Slight |
| Tue 14 Feb 1989 | Harrow | 1 | 1 | Slight |
| Fri 17 Feb 1989 | Harrow | 1 | 1 | Slight |
| Fri 17 Feb 1989 | Harrow | 2 | 1 | Slight |
| Sat 25 Feb 1989 | Harrow | 2 | 1 | Slight |
| Tue 28 Feb 1989 | Harrow | 2 | 1 | Slight |
| Tue 28 Feb 1989 | Harrow | 2 | 1 | Slight |
| Sun 5 Mar 1989 | Harrow | 1 | 1 | Slight |
| Mon 6 Mar 1989 | Harrow | 1 | 1 | Slight |
| Mon 6 Mar 1989 | Harrow | 1 | 1 | Slight |
| Fri 10 Mar 1989 | Harrow | 2 | 1 | Slight |
| Fri 10 Mar 1989 | Harrow | 2 | 2 | Slight |
| Sun 19 Mar 1989 | Harrow | 2 | 1 | Slight |
| Wed 22 Mar 1989 | Harrow | 3 | 1 | Slight |
| Sat 25 Mar 1989 | Harrow | 1 | 1 | Slight |
| Sat 1 Apr 1989 | Brent | 1 | 1 | Serious |
| Tue 4 Apr 1989 | Harrow | 1 | 8 | Slight |
| Sun 9 Apr 1989 | Harrow | 1 | 1 | Slight |
| Tue 11 Apr 1989 | Brent | 2 | 1 | Slight |
| Tue 11 Apr 1989 | Harrow | 1 | 1 | Slight |
| Wed 12 Apr 1989 | Harrow | 2 | 1 | Serious |
| Tue 18 Apr 1989 | Harrow | 1 | 1 | Slight |
| Tue 18 Apr 1989 | Harrow | 1 | 1 | Slight |
| Wed 19 Apr 1989 | Harrow | 2 | 1 | Slight |
| Sat 22 Apr 1989 | Harrow | 2 | 3 | Serious |
| Tue 25 Apr 1989 | Harrow | 2 | 1 | Slight |
| Thu 27 Apr 1989 | Harrow | 2 | 1 | Slight |
| Tue 2 May 1989 | Harrow | 2 | 1 | Slight |
| Sat 20 May 1989 | Harrow | 2 | 1 | Serious |
| Mon 22 May 1989 | Harrow | 1 | 1 | Slight |
| Thu 1 Jun 1989 | Harrow | 1 | 1 | Slight |
| Sat 3 Jun 1989 | Harrow | 2 | 1 | Slight |
| Wed 7 Jun 1989 | Harrow | 2 | 1 | Slight |
| Wed 7 Jun 1989 | Harrow | 1 | 1 | Slight |
| Fri 9 Jun 1989 | Harrow | 2 | 1 | Slight |
| Sat 10 Jun 1989 | Harrow | 2 | 2 | Serious |
| Sat 10 Jun 1989 | Harrow | 2 | 2 | Serious |
| Sun 18 Jun 1989 | Harrow | 1 | 1 | Slight |
| Wed 21 Jun 1989 | Harrow | 1 | 1 | Slight |
| Wed 21 Jun 1989 | Harrow | 1 | 1 | Slight |
| Sat 24 Jun 1989 | Harrow | 1 | 1 | Slight |
| Tue 27 Jun 1989 | Harrow | 2 | 1 | Slight |
| Wed 28 Jun 1989 | Harrow | 1 | 1 | Slight |
| Sat 1 Jul 1989 | Harrow | 2 | 1 | Slight |
| Sun 2 Jul 1989 | Harrow | 2 | 1 | Slight |
| Thu 6 Jul 1989 | Harrow | 2 | 2 | Serious |
| Fri 7 Jul 1989 | Harrow | 2 | 1 | Slight |
| Wed 12 Jul 1989 | Harrow | 1 | 1 | Slight |
| Thu 13 Jul 1989 | Harrow | 1 | 1 | Slight |
| Fri 14 Jul 1989 | Harrow | 2 | 1 | Serious |
| Wed 19 Jul 1989 | Harrow | 1 | 1 | Slight |
| Wed 19 Jul 1989 | Harrow | 1 | 1 | Slight |
| Sat 22 Jul 1989 | Harrow | 1 | 1 | Slight |
| Sat 29 Jul 1989 | Harrow | 2 | 1 | Slight |
| Sat 5 Aug 1989 | Harrow | 2 | 1 | Slight |
| Thu 10 Aug 1989 | Harrow | 1 | 1 | Slight |
| Thu 10 Aug 1989 | Harrow | 2 | 1 | Slight |
| Fri 11 Aug 1989 | Harrow | 1 | 1 | Slight |
| Tue 15 Aug 1989 | Harrow | 1 | 1 | Slight |
| Wed 16 Aug 1989 | Harrow | 2 | 1 | Slight |
| Thu 17 Aug 1989 | Harrow | 4 | 5 | Slight |
| Sat 19 Aug 1989 | Harrow | 2 | 1 | Slight |
| Sat 19 Aug 1989 | Harrow | 2 | 1 | Slight |
| Sun 27 Aug 1989 | Harrow | 2 | 3 | Serious |
| Wed 30 Aug 1989 | Harrow | 1 | 1 | Slight |
| Wed 30 Aug 1989 | Harrow | 1 | 1 | Slight |
| Wed 6 Sep 1989 | Harrow | 1 | 1 | Slight |
| Wed 6 Sep 1989 | Harrow | 2 | 1 | Serious |
| Sat 9 Sep 1989 | Harrow | 2 | 1 | Slight |
| Thu 14 Sep 1989 | Harrow | 1 | 1 | Serious |
| Thu 21 Sep 1989 | Harrow | 2 | 1 | Slight |
| Thu 21 Sep 1989 | Harrow | 1 | 1 | Slight |
| Fri 22 Sep 1989 | Harrow | 2 | 1 | Slight |
| Tue 26 Sep 1989 | Harrow | 2 | 1 | Serious |
| Sat 30 Sep 1989 | Harrow | 1 | 1 | Serious |
| Tue 3 Oct 1989 | Harrow | 1 | 1 | Serious |
| Fri 6 Oct 1989 | Harrow | 2 | 4 | Serious |
| Tue 10 Oct 1989 | Harrow | 1 | 1 | Slight |
| Fri 13 Oct 1989 | Harrow | 1 | 2 | Slight |
| Fri 20 Oct 1989 | Harrow | 2 | 1 | Slight |
| Mon 23 Oct 1989 | Harrow | 3 | 1 | Slight |
| Thu 26 Oct 1989 | Harrow | 2 | 1 | Slight |
| Sat 28 Oct 1989 | Harrow | 2 | 1 | Slight |
| Mon 30 Oct 1989 | Harrow | 1 | 1 | Slight |
| Fri 24 Nov 1989 | Harrow | 2 | 1 | Slight |
| Sat 25 Nov 1989 | Harrow | 1 | 1 | Slight |
| Sun 26 Nov 1989 | Harrow | 2 | 1 | Slight |
| Tue 28 Nov 1989 | Harrow | 1 | 2 | Slight |
| Thu 30 Nov 1989 | Harrow | 1 | 4 | Slight |
| Fri 1 Dec 1989 | Harrow | 2 | 1 | Slight |
| Fri 8 Dec 1989 | Harrow | 2 | 1 | Slight |
| Thu 14 Dec 1989 | Harrow | 2 | 1 | Slight |
| Sun 24 Dec 1989 | Harrow | 2 | 2 | Slight |
| Thu 28 Dec 1989 | Harrow | 1 | 1 | Slight |